Question

The cost of papering four walls of a room at the rate of 70 paise per sq m in rupees 157.50 The height of the room is 5m. Find the length and breadth of the room if they are in the ratio of 4:1​

Answer 1

Answer:

Your Answer is :

Step-by-step explanation:

Height 5 meters.

Answer 2

Let the length and breadth of the room be 4y m and y m respectively.

⇒$\sf \: Area \: \: of \: \: four \: \: walls \\ \: \: \sf \: of \: \: room = 2(l+b)h \\ \\ ⇒\sf=2(4y+y)×5 \\ \\ ⇒\sf= 50y \: m²$

Cost of papering four walls of the room at 70 paise

Cost of papering four walls of the room at 70 paiseper square m.

$\sf50y \times 0.70₹ \\ \\ = \sf₹35y$

According to the question ;

$\sf35y = 157.50 \\ \\ \sf \: y = \frac{157.50}{35} = 4.5$

∴ Breadth of the wall : 4.5m

∴ Length of the wall : 18m

I HOPE IT HELPS.